. Author manuscript; available in PMC: 2013 Nov 11.

Published in final edited form as: J Neurosurg Spine. 2010 Dec;13(6):10.3171/2010.6.SPINE10200. doi: 10.3171/2010.6.SPINE10200

TABLE 5. Pressure recordings in 15 patients with persistent syringomyelia and in 18 healthy volunteers^*.

Measurement	Patients Before Revision Op	Patients After Revision Op (p value)	Healthy Volunteers (p value)
cervical pressure (mm Hg)
mean pressure	16.7 ± 2.7^†	10.9 ± 3.1 (0.11)^‡	11.2 ± 2.5 (0.0003)
pulse pressure	2.8 ± 1.0^†	2.1 ± 1.4 (0.27)^‡	1.6 ± 0.6 (0.002)
lumbar pressure (mm Hg)
mean pressure	13.7 ± 4.4	11.0 ± 2.7 (0.03)^§	11.2 ± 2.3 (0.97)
pulse pressure	1.0 ± 0.7	1.0 ± 0.6 (0.78)	1.0 ± 0.5 (0.97)
craniospinal compliance (ml CSF/mm Hg)	3.4 ± 1.7^†	5.3 ± 3.5 (0.10)	6.0 ± 4.0 (0.02)
jugular compression
rate of increase (mm Hg/second)	3.5 ± 2.6^†	5.6 ± 3.3 (0.004)^§	6.3 ± 2.0 (0.006)
peak intrathecal pressure	32.5 ± 11.6	37.3 ± 8.6 (0.10)	35.4 ± 8.9 (0.42)

Values expressed as the means ± SDs. One patient (a minor) did not undergo pressure recording.

^†

Significant difference compared with healthy volunteers (unpaired t-test).

^‡

Only 6 patients underwent cervical pressure recording after surgery.

^§

Significant difference compared with before revision surgery (paired t-test).

TABLE 5. Pressure recordings in 15 patients with persistent syringomyelia and in 18 healthy volunteers*.